Television – Camera – system and detail – Optics
Patent
1997-10-07
1999-02-02
Shalwala, Bipin
Television
Camera, system and detail
Optics
348240, 348333, 396379, G03B 1700, H04N 5225, H04N 5262
Patent
active
058672176
ABSTRACT:
A lens position control device for a rear-focus type zoom lens includes a rear-focus type zoom lens, an image pickup element for converting an optical image formed by the zoom lens into an electrical signal, a signal processing circuit for executing signal processing of the electrical signal so as to obtain an electronic zooming effect, a focus detection circuit for detecting a focus adjustment state of the zoom lens, a memory for storing information associated with movement of a focusing lens group according to lens positions of a variable magnification lens group and a focusing lens group of the zoom lens, and a control circuit for, when it is determined based on an output from the focus detection circuit that the zoom lens is in an in-focus state, moving the focusing lens group on the basis of the position of the variable magnification lens group and the information stored in the memory, and for, when it is determined that the zoom lens is in an out-of-focus state, performing a zooming operation on the basis of a signal processing result of the signal processing circuit, and moving the focusing lens group on the basis of information detected by the focus detection circuit.
REFERENCES:
patent: 4843475 (1989-06-01), Imai
patent: 4963981 (1990-10-01), Todaka et al.
patent: 4969044 (1990-11-01), Hijikata et al.
patent: 5023722 (1991-06-01), Ryu
patent: 5107334 (1992-04-01), Matsumoto
patent: 5420632 (1995-05-01), Yamagiwa
Ichinose Harunobu
Okino Tadashi
Canon Kabushiki Kaisha
Shalwala Bipin
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